So what's wrong with the current system?
Your only complaint appears to be that the main speakers are too heavy. Get some lighter ones...

You mention you haven't any monitors. If you want to add proper monitors you'll need a mixer than can produce a foldback mix. It will get more complicated and you want it idiot-proof!

For simplicity you could look at active speakers for both mains and monitors - fewer and less confusing interconnects. You can strap the power and audio cables together in pairs to simplify inventory. Then you'll have a system where everything else plugs into the mixer.

But apart from the heavy speakers... if it ain't broke don't fix it !?

Anahata